Ways to raise factory REV LIMITER??

NewAge 5.0 · 01-18-2002, 12:59 AM

what are the best ways to go about raising the factory rev limiter? i have heard terms like eec extender, pms, chips.. whats the word on the street?? my car is daily driven but abused on the highways.. and local tracks.. I am switching intakes and was told i will need to shift at a higher RPM i was thinking 6500 my factory REV works exactly 6250... what should I do and what are my PRICE options? custom chip? extender? what??

WADS56 · 01-18-2002, 02:02 AM

It all depends on what you want to spend. FAST, EPEC, or a PMS would be the best if you want to get the max out of you setup and program it your self. They are allot of cash.
FMS extenders can adjust your fuel and rev limit by thr turn of a knob and will cost a much as a custom chip.
A custom chip would be a good choice if you got it done on a dyno. They can tune it just as good as a EPEC or a PMS, but you can not make changes down the road.

Five0 · 01-18-2002, 06:14 AM

You can extend your rpm range by 200 rpm's for free by rewireing your fuel pump to a switched power and taking the computers control of it away. The injectors cut off at 6450 though and you will need something for the computer to get by that.

Stang Runner · 01-18-2002, 10:02 AM

I bet the I have that done to my car!!!!! i dont have the limt at 6250 It goes to about 6400 Hard to see it good but BAM Flops I never could frigre how come I didnt have the 6250 limit That it stock on the car. But I realy dont whan't that much RPM on the stock short end. BUT THX Know I think I know that I might realy have a 6450 limit the wireing on the car has been redone too. I pulled out a car Pager On it last year And it was still sending after 4 years i glad the last guy it not get it was a repo car.

302 LX Eric · 01-18-2002, 10:27 AM

Wade pretty much summed it up.

Are you sure that more RPM's is what you need? Have you have it on a dyno to see "where" you are making power? When I dyno'd mine I was a little surprised to see that HP dropped off dramatically after 6000 and peak HP came at 5300 rpms! Just something to think about.

Take it easy,
E

01-18-2002, 12:59 AM	#1
NewAge 5.0 Registered Member Join Date: Mar 1999 Location: Sanford NC USA Posts: 155	Ways to raise factory REV LIMITER?? what are the best ways to go about raising the factory rev limiter? i have heard terms like eec extender, pms, chips.. whats the word on the street?? my car is daily driven but abused on the highways.. and local tracks.. I am switching intakes and was told i will need to shift at a higher RPM i was thinking 6500 my factory REV works exactly 6250... what should I do and what are my PRICE options? custom chip? extender? what?? __________________ 88 Hatch 10.60's @ 130 89 Hatch Not as fast but holds its own

01-18-2002, 02:02 AM	#2
WADS56 gear banger Join Date: Aug 2000 Location: CHICAGO Posts: 1,144	It all depends on what you want to spend. FAST, EPEC, or a PMS would be the best if you want to get the max out of you setup and program it your self. They are allot of cash. FMS extenders can adjust your fuel and rev limit by thr turn of a knob and will cost a much as a custom chip. A custom chip would be a good choice if you got it done on a dyno. They can tune it just as good as a EPEC or a PMS, but you can not make changes down the road. __________________ 79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor 93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe Ricer hater's club member #49

01-18-2002, 06:14 AM	#3
Five0 Registered Member Join Date: Apr 2000 Location: middleburg, fl, usa Posts: 1,134	You can extend your rpm range by 200 rpm's for free by rewireing your fuel pump to a switched power and taking the computers control of it away. The injectors cut off at 6450 though and you will need something for the computer to get by that. __________________ James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier.

01-18-2002, 10:02 AM	#4
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	I bet the I have that done to my car!!!!! i dont have the limt at 6250 It goes to about 6400 Hard to see it good but BAM Flops I never could frigre how come I didnt have the 6250 limit That it stock on the car. But I realy dont whan't that much RPM on the stock short end. BUT THX Know I think I know that I might realy have a 6450 limit the wireing on the car has been redone too. I pulled out a car Pager On it last year And it was still sending after 4 years i glad the last guy it not get it was a repo car. __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

01-18-2002, 10:27 AM	#5
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Wade pretty much summed it up. Are you sure that more RPM's is what you need? Have you have it on a dyno to see "where" you are making power? When I dyno'd mine I was a little surprised to see that HP dropped off dramatically after 6000 and peak HP came at 5300 rpms! Just something to think about. Take it easy, E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

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